16 yr old mini dachshund

Hello, I have a 16 yr old mini dachshund who have had since she was 8 weeks old.... she was my very first dog so senior life is new to me. She went to the vet in march 2020 and I was told she was in good health aside from arthritis trying to set up in her little legs.
Over the year her eyes have gotten very cloudy, weight wont seem to stay on, and she sleeps 95% of the day, barely makes it to the puppy pads on a good day but shes my baby.....

I guess my question is how do you know when to do more for them? I dont feel it's her time to leave me just yet but I don't know what to do to help her see or anything to help... shes ran into a few doors and then it's like she gives up and goes back to her bed

I have her food and water semi close to her bed so she can find it, and she sleeps in my room so I can hear her pitter pat (haha) she has helped me through so much I just wanna help her now....